3857843121 has 24 divisors (see below), whose sum is σ = 5657743392. Its totient is φ = 2336505600.

The previous prime is 3857843111. The next prime is 3857843137. The reversal of 3857843121 is 1213487583.

3857843121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3857843121 - 2⁹ = 3857842609 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3857843111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 752850 + ... + 757956.

It is an arithmetic number, because the mean of its divisors is an integer number (235739308).

Almost surely, 2^3857843121 is an apocalyptic number.

It is an amenable number.

3857843121 is a deficient number, since it is larger than the sum of its proper divisors (1799900271).

3857843121 is a wasteful number, since it uses less digits than its factorization.

3857843121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7213 (or 7202 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 3857843121 is about 62111.5377446091. The cubic root of 3857843121 is about 1568.3687766306.

The spelling of 3857843121 in words is "three billion, eight hundred fifty-seven million, eight hundred forty-three thousand, one hundred twenty-one".